Reverse the order by which variables are populated

On Arch Linux, when asking for the description, we get it:

	$ ./lsb_release -d
	Description:    Arch Linux

But when we ask for the codename of the release as well, the description
is set to "(none)".

	$ ./lsb_release -d -c
	Description:    (none)
	Codename:       n/a

This happens because when we request the codename, in GetDistribInfo(),
we trigger the InitDistribInfo() logic when -c is given. This overrides
the DISTRIB_DESCRIPTION variable that has been parsed from
/etc/lsb-release.

However, according to lsb_release/src/lsb_release.examples:

	Optional fields are DISTRIB_ID, DISTRIB_RELEASE,
	DISTRIB_CODENAME, DISTRIB_DESCRIPTION and can be used to
	override information which is parsed from the
	"/etc/distrib-release" file.

This means that we're actually invoking GetLSBInfo() and
GetDistribInfo() in reverse order. We should invoke GetDistribInfo()
first so that it can be overridden by GetLSBInfo() later. Reverse the
calling order of these two functions.

Since we've reversed the calling order, GetDistribInfo() will never have
any of the variables populated when it's called so remove the checks for
those.

Author: Denton-L

lsb_release/src/lsb_release

@@ -51,11 +51,11 @@
 # - changed Debian specifics, codename anticipates release num
 #
 # Description:
-# Collect information from sourceable /etc/lsb-release file (present on
-# LSB-compliant systems) : LSB_VERSION, DISTRIB_ID, DISTRIB_RELEASE,
-# DISTRIB_CODENAME, DISTRIB_DESCRIPTION (all optional)
+# Find and parse the /etc/[distro]-release file
+# Collect information from sourceable /etc/lsb-release file for overriding
+# (present on LSB-compliant systems) : LSB_VERSION, DISTRIB_ID,
+# DISTRIB_RELEASE, DISTRIB_CODENAME, DISTRIB_DESCRIPTION (all optional)
 # Then (if needed) find and add names from /etc/lsb-release.d
-# Then (if needed) find and parse the /etc/[distro]-release file
 
 
 ###############################################################################
@@ -274,13 +274,7 @@ EASE ($DISTRIB_CODENAME)"
 
 # Check missing and requested infos, then find the file and get infos
 GetDistribInfo() {
-    NO=""  # /etc/lsb-release data are enough to reply what is requested?
-    [ -n "$ARG_D" ] && [ -z "$DISTRIB_DESCRIPTION" ] && NO="y"
-    [ -z "$NO" ] && [ -n "$ARG_I" ] && [ -z "$DISTRIB_ID" ] && NO="y"
-    [ -z "$NO" ] && [ -n "$ARG_R" ] && [ -z "$DISTRIB_RELEASE" ] && NO="y"
-    [ -z "$NO" ] && [ -n "$ARG_C" ] && [ -z "$DISTRIB_CODENAME" ] && NO="y"
-
-    if [ -n "$NO" ]
+    if [ -n "$ARG_D" ] || [ -n "$ARG_I" ] || [ -n "$ARG_R" ] || [ -n "$ARG_C" ]
     then
         if [ ! -f "$CHECKFIRST" ]
         then
@@ -410,8 +404,8 @@ then
 fi
 
 # Initialization
-GetLSBInfo
 GetDistribInfo
+GetLSBInfo
 
 # Display requested infos (order as follow)
 [ -n "$ARG_V" ] && DisplayVersion